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/** Switch to userspace - low level code.
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/** Switch to userspace - low level code.
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 *
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 *
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 * @param in0 Userspace entry point address.
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 * @param in0 Userspace entry point address.
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 * @param in1 Userspace stack pointer address.
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 * @param in1 Userspace stack pointer address.
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 * @param in2 Userspace register stack pointer address.
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 * @param in2 Userspace register stack pointer address.
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 * @param in3 Userspace address of thread uspace_arg_t structure.
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 * @param in3 Value to be stored in IPSR.
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 * @param in4 Value to be stored in IPSR.
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 * @param in4 Value to be stored in RSC.
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 * @param in5 Value to be stored in RSC.
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 */
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 */
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.global switch_to_userspace
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.global switch_to_userspace
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switch_to_userspace:
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switch_to_userspace:
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	alloc loc0 = ar.pfs, 5, 3, 0, 0
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	alloc loc0 = ar.pfs, 6, 3, 0, 0
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	rsm (PSR_IC_MASK | PSR_I_MASK)		/* disable interruption collection and interrupts */
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	rsm (PSR_IC_MASK | PSR_I_MASK)		/* disable interruption collection and interrupts */
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	srlz.d ;;
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	srlz.d ;;
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	srlz.i ;;
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	srlz.i ;;
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	mov cr.ipsr = in3
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	mov cr.ipsr = in4
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	mov cr.iip = in0
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	mov cr.iip = in0
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	mov r12 = in1
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	mov r12 = in1
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	xor r1 = r1, r1
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	xor r1 = r1, r1
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	mov ar.rsc = loc1 ;;			/* put RSE into enforced lazy mode */
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	mov ar.rsc = loc1 ;;			/* put RSE into enforced lazy mode */
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	flushrs ;;
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	flushrs ;;
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	mov ar.bspstore = in2 ;;
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	mov ar.bspstore = in2 ;;
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	mov ar.rsc = in4 ;;
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	mov ar.rsc = in5 ;;
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	mov r8 = in3
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	rfi ;;
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	rfi ;;